CD4 and tuberculosis: Of the 46 lost to follow-up, median time to loss was 522 person days (IQR 223-706), median baseline CD4 137 cells/μl (IQR 60-162) and log10 HIV RNA 4.59 copies/ml (IQR 4.23-5.26), 37 had no prevalent or incident TB, 9 had prevalent and 6 incident TB.